1 / 51

What is the oxidation number for this element?

A neutral atom of gold (Au) has a mass number of 197 and has 118 neutrons . How many electrons does this gold atom have? A ) 79 electrons B) 118 electrons C) 197 electrons D) 315 electrons.

kosey
Télécharger la présentation

What is the oxidation number for this element?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. A neutral atom of gold (Au) has a mass number of 197 and has 118 neutrons. How many electrons does this gold atom have?A) 79 electronsB) 118 electronsC) 197 electronsD) 315 electrons

  2. Based on its position in the periodic table, which element is most likely to form a negative charged ion?A) gold (Au) B) neon (Ne)C) barium (Ba) D) chlorine (Cl) What is the oxidation number for this element? • 1+ B)1- c)2+ D)2-

  3. Which trend is observed when moving from left to right in the second row of the periodic table, beginning with lithium (Li) and ending with neon (Ne)?A) The atomic mass increases by one with each element.B) The number of energy levels increases by one with each element.C) The atomic radius increases by one with each element.D) The number of electrons in the outer shell increases by one with each element.

  4. An object is pushed with a force and begins to move across a frictionless surface.Which best describes the object's motion after the force stops acting?A) constant velocity B) increasing velocity C) variable acceleration D) decreasing acceleration

  5. Which best describes the energy change as the pendulum moves from position 1 to position 2? A) The total energy is decreasing. B) The kinetic energy is increasing. C) The thermal energy is decreasing. D) The potential energy is increasing.

  6. Which lists the colors of visible light in order from shortest wavelength to longest wavelength?A)blue,green,red,yellow B) red,yellow,green,blueC) blue,green,yellow,red D) yellow,red,green,blue

  7. George used the same force to push on three boxes. The boxes weighed 30N, 50N and 100N. Which boxed moved the most quickly and which one the most slowly? A) The 100N the most quickly and the 30N most slowly. B) The 50N the most quickly and the 100N most slowly. C) The 50N the most quickly and the 30N most slowly. D) The 30N the most quickly and the 100N most slowly. What formula would you use to prove this answer? F = ma or a = F/m

  8. At what temperature does ice melt?A) 10 degrees CelsiusB) 100 degrees CelsiusC) 0 degrees CelsiusD) 90 degrees Celsius

  9. When sugar seems to disappear in water, it...A) evaporatesB) conductsC) condensesD) dissolves Is this a (a)chemical change or a (b)physical change? Physical change

  10. A push or pull on an object is called...A) inertiaB) energyC) forceD) vibration

  11. Which of the following has the greatest inertia?A) planetB) bowling ballC) carD) train

  12. What must be applied to an object to change its motion or direction?A) forceB) speedC) densityD) inertia

  13. Planets and moons in the solar system keep moving due to...A) magnetismB) forceC) inertiaD) gravity C) INERTIA

  14. What is the average speed of a car that travels 60 kilometers in 2 hours? A) 30 km/hr B) 30 km/hr/sec C) 60 km/hr D) 60 km/hr/sec What formula do you use to solve this question? Speed = distance / time

  15. The speed of an object increases from 30 m/s to 60m/s in 10 seconds. What is its acceleration? A) 300 m/s2B) 20 m/s2C) 3 m/s2D) 0.33 m/s2 What formula do you use to solve this question? a = vfinal–vinitial time

  16. If a 6.0-N force is required to move a box through a distance of 2.0 m, how much work is done? A) 3.0 JB) 4.0 JC) 8.0 JD) 12 J Formula? Work = force X distance = 6.0-N x 2.0 m = 12 Nm = 12 J

  17. Which of the following is an example of kinetic energy? A) a car not movingB) a rock resting on a ledgeC) water falling over a damD) a person sitting in a chair REMEMBER = Kinetic Energy is in MOTION. The amount of Energy depends on its MASSand SPEED

  18. Which term best explains what happens when a student warms his hand by placing it in a hot water bottle? A) thermal expansionB)conductionC)convectionD)radiation

  19. What happens when electrical charges are brought together? A) Unlike charges attract and like charges repel.B) Unlike and like charges attract.C)Like charges attract and unlike charges repel.D) Like charges attract and repel.

  20. What is the resistance of a hair dryer that uses 2.5 A when the voltage is 120 V? A) 4.8 ohmsB) 48 ohmsC) 120 ohmsD) 300 ohms Current = voltage/resistance I = V/R V I R

  21. In comparison to other electromagnetic waves, which of the following statements about gamma rays is true?A) They have the longest wavelength.B) They have the lowest frequency.C) They have the lowest amplitude.D) They have the highest photon energy.

  22. DOPPLER EFFECT If the source of a sound is moving away from you, what characteristic of the sound waves reaching your ears decreases? A) quality B) velocity C) frequency D) wavelength

  23. What do all atoms of the same element have in common? A) number of neutronsB) mass numberC) atomic massD) atomic number The ATOMIC NUMBER equals the number of ____________ in the atom. protons

  24. What causes an object to have a positive charge? A) Protons are removed.B) Protons are added C) Electrons are removed. D) Electrons are added

  25. Which of the following elements is chemically most similar to cesium? A) rubidiumB) xenon C) helium D)barium Both elements are in the same _____________. group/family

  26. Why are the noble gases so unreactive?A)Their outer shell has 1 electron.B)Their outer shell has 2 electrons.C) Their outer shell is filled.D) Their outer shell needs one electron to be full.

  27. The diagram below is a complete circuit. If Bulb B burns out what will the result in the circuit? A) All bulbs will go out. B) Only bulb A will continue to be lit. C) Only bulb C will continue to be lit. D) Bulbs A and C will continue to be lit. A B C What type of circuit is this? SERIES CIRCUIT

  28. What is the formula for aluminum oxide? A) AlO2 B) Al2O C) Al2O3 D) AlO Remember to use your periodic table Put in your oxidation numbers, if they do not add up to zero, then use the criss-cross method to correct the formula.

  29. Water is often called the universal solvent. The pH of water is about 7. Adding bleach to pure water would make the pH ________________.A) go down B) go up C) stay the same D) more temperature dependent Use your reference table !

  30. Nuclear fission is a powerful energy source, used in both nuclear power plants and atomic bombs. Which statement is a possible description of the nuclear fission of an atom of U-235? A) An atom of krypton-94, an atom of barium-139 and two neutrons join together to form an atom of U-235.B) An atom of krypton-94, an atom of barium-139 and three neutrons join together to form an atom of U-235 plus a neutron.C) U-235 absorbs one neutron and splits into an atom of krypton-94, an atom of barium-139 and three neutrons.D) U-235 absorbs one neutron and splits into an atom of krypton-94, an atom of barium-139 and two nuetrons.

  31. Which of the following might be the effect of an unbalanced force acting on an object? A) An unbalanced force can only cause an object to slow down.B) An unbalanced force can cause an object to speed up only.C) An unbalanced force can cause an object to speed up, slow down, or change direction.D) An unbalanced force can only cause a change in direction of motion.

  32. Which of the following lists electromagnetic radiations from lowest to highest energies?A) microwaves, radio waves, visible light, X-raysB) radio waves, infrared radiation, visible light, UV radiationC) radio waves, microwaves, UV radiation, visible lightD) infrared radiation, visible light, gamma radiation, X-rays

  33. Refer to the equation below. It gives off heat as a product. P4 + 5O2 -> P4O10 It is a/an __________ reaction. A) exothermic B) neutralization C) endothermic D) decomposition

  34. An ionic bond results from __________ electrons, while a covalent bond is a result of _________ electrons. A) shared, transferred B) transferred, shared C) outer, inner D) inner, outer transferred shared

  35. A battery provides a total of 2.0 volts to a video game controller. If the controller has an operating resistance of 4.0 ohms, the current through the video game controller is A) 2.0A B) .50A C) 8.0A D) 6.0A Remember to use your reference table V I R

  36. Which of the following correctly places the phases of water in order from the most dense to the least dense? A) solid, liquid, gas, plasmaB) plasma, gas, liquid, solidC)liquid, solid, gas, plasmaD)liquid, gas, plasma, solid Remember water EXPANDS when it freezes therefore it ‘s volume increases and the density will decrease.

  37. When a potassium atom (K) forms a potassium ion (K+), the atom A) gains a proton B) gains an electronC) loses a proton D) loses an electron

  38. The nucleus of an atom of gold-198 contains A) 79 protons and 119 neutrons.B) 79 protons and 118 neutrons.C) 197 protons and 197 neutronsD) 198 protons and 198 neutrons

  39. Which process represents a chemical change? A) melting of ice B) corrosion of iron C) evaporation of alcohol D) crystallization of sugar

  40. Which of the following substances is acidic? A) liquid soap B) vinegar C) baking sodaD) flour Did you refer to your reference table ?

  41. Select the type of matter that includes solutions. A) ionic compounds B) molecular compounds C) heterogeneous mixtures D) homogeneous mixtures

  42. Increasing the current applied to an electromagnet will affect which of the following? A) the voltage delivered by the electromagnetB) the magnetic field exerted by the electromagnetC) the mass of the electromagnetD) the nulcear force delivered by the electromagnet

  43. A wet cell battery is an example of stored potential energy. Once connected to a load, the stored energy is converted. Describe the conversion of energy that results in the movement of the hands in a battery-powered clock..A)chemical to electrical to mechanical B) chemical to thermal to electricalC) chemical to electrical to mechanicalD) chemical to electrical to thermal

  44. A given radionuclide RA has a half life of 100 years. Another radionuclide RB has a half life of 25 years. One thousand kilograms of each material are placed in a hazardous waste receptacle. How many of each will be around after 100 years? A) 500 kgRA and 62.5 kg RBB)500 kg RA and 125 kg RBC) 250 kg RA and 250 kg RBD) 250 kg RA and 125 kg RB

  45. Find the amount of work done when 30 N of force is used to lift a box 400 cm. A) 7.5 JoulesB) 13.3 JoulesC) 120 JoulesD) 12000 Joules

  46. Select the balanced chemical equation. A) Zn + HCl -> ZnCl2 + H2B) C2H4 + 2O2 -> 2CO2 + 2H2OC) 2Na + 2H2O -> 2NaOH + H2D) 2CaCO3 + H2SO4 -> 2CaSO4 + H2O + CO3

More Related